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. Author manuscript; available in PMC: 2010 Dec 20.
Published in final edited form as: IEEE J Sel Top Signal Process. 2009 Feb 1;3(1):159–169. doi: 10.1109/JSTSP.2008.2011116

Fig. 3.

Fig. 3

Local invertibility sufficient condition space in 2D, for k = 1/4, kx = ky = 1/2 and Kx = Ky = ∞. C4 corresponds to using a fixed k value. (a) a > −1/2 and d > −1/2. (b) |b| < 1/2 and |c| < 1/2.